Tanzanite is a beautiful gemstone that is known for its vibrant blue color. It is a rare gemstone that is only found in the Mererani Hills of Tanzania, and is considered to be one of the most valuable gemstones in the world. Tanzanite has a Mohs hardness of 6.5-7, making it suitable for use in jewelry. It is also a pleochroic gemstone, meaning it can display different colors when viewed from different angles. Overall, tanzanite is a stunning gemstone that is highly sought after by collectors and jewelry enthusiasts alike.